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chromium/third_party/blink/web_tests/css3/background/background-size-scaled-subset-of-small-image.html 

<!DOCTYPE html>
<title>Image background with large background-size from small image</title>
<link rel="help" href="https://drafts.csswg.org/css-backgrounds-3/#background-size">
<link rel="help" href="https://drafts.csswg.org/css-backgrounds-3/#background-image">
<link rel="author" title="schenney" href="mailto:[email protected]">
<div style="background-image: url('resources/rgr-grg-rgr-3x3.png');
            background-size: 300px 300px;
            width: 125px; height: 125px;">
</div>